If you're under 5 feet tall, start with 100 pounds and subtract 2 pounds per inch. BMI Calculator Body Mass Index How Much Should I Weigh: Charts by Height, Age, and Gender Using the above formula, you can calculate your desirable ideal body weight for both males and females. Ideal Body Weight . BMI recommendations differ based on your gender and other variables. What is the SBMI? BMI Values: Less than 16.0 - Severely Underweight; From 16.0 to 18.5 - Underweight; From 18.6 to 25.0 - Normal Weight; From 25.1 to 30 . Click "Calculate BMI" and then look at the chart below for the results. Adult BMI Calculator | Healthy Weight, Nutrition, and Physical Activity ... To determine your BMI divide your weight in kilograms by your height in metres squared. This calculator computes the body mass index and rates it appropriately for men, women, children, juveniles and seniors. A BMI of less than 18.5 . How Much Should I Weigh? | Ideal Weight Calculator If you're looking at body structure as differences in frame size / width of skeleton, then the original ideal weight tables from the 1960s had a correction of plus-minus 10 % of body weight. This calculator functions on the basis of the newly developed Smart Body Mass Index. Tips. Divide weight by total inches squared and multiply the result by 703. Adult BMI Calculator | Healthy Weight, Nutrition, and Physical Activity ... You can also determine your BMI using the table below. "This scale was created years ago and is based on Caucasian men and women. large=wrist size over 7.5". Gender Formula: Mother's age + month of conception (1-12) plus constant based on mother's age (15 if less than 21, 21 if between 21 and 28, 28 if between 28 and 36, 36 if between 36 and 45, 45 if between 45 and 55, 55 if greater than or equal to 55) = answer. Method 1. Determine your frame size using the body frame size calculator. A normal BMI is between18.5 and 25; a person with a BMI between 25 and 30 is considered overweight; and a person with a BMI over 30 is considered obese.